Lightweight mullite heat-insulating brick easy to splice

The utility model discloses a light easily-spliced mullite heat-insulating brick, relates to the technical field of mullite heat-insulating brick structures, and aims to solve the problems that the periphery of the heat-insulating brick in the prior art is not provided with a splicing structure, and the heat-insulating brick is planar, so that the heat-insulating brick is easy to be unstable in the mounting process, and the mounting stability and efficiency of the heat-insulating brick are influenced. Through holes are formed in the first heat insulation brick and the second heat insulation brick, and the number of the through holes is four; the convex surfaces are arranged on the front end surfaces of the first heat-insulating brick and the second heat-insulating brick, grooves are formed in the rear end surfaces of the first heat-insulating brick and the second heat-insulating brick, and supporting bases are arranged on the two sides of each groove; the splicing grooves are formed in the end faces of one si